/*
 * Copyright (C) 2010 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.zxing.android.decode;

import android.graphics.Bitmap;
import android.graphics.Rect;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.util.Log;

import com.google.zxing.R;
import com.google.zxing.android.CaptureActivity;
import com.google.zxing.core.PlanarYUVLuminanceSource;
import com.google.zxing.core.Result;
import com.google.zxing.qrcode.QRCodeReader;

import java.io.ByteArrayOutputStream;
import java.util.concurrent.TimeUnit;

public class DecodeHandler extends Handler {

    private static final String TAG = DecodeHandler.class.getSimpleName();

    private final CaptureActivity activity;
    private boolean running = true;

    public DecodeHandler(CaptureActivity activity) {
        this.activity = activity;
    }

    @Override
    public void handleMessage(Message message) {
        if (message == null || !running) {
            return;
        }
        if (message.what == R.id.decode) {
            decode((byte[]) message.obj, message.arg1, message.arg2);
        } else if (message.what == R.id.quit) {
            running = false;
            Looper.myLooper().quit();
        }
    }

    /**
     * Decode the data within the viewfinder rectangle, and time how long it took. For efficiency,
     * reuse the same reader objects from one decode to the next.
     * @param data   The YUV preview frame.
     * @param width  The width of the preview frame.
     * @param height The height of the preview frame.
     */
    private void decode(byte[] data, int width, int height) {

        final Handler handler = activity.getHandler();
        if (null == handler)
            return;

        long start = System.nanoTime();

        Rect rect = activity.getCameraManager().getFramingRectInPreview();
        PlanarYUVLuminanceSource source = QRCodeReader.obtain().source(rect, data, width, height);
        Result rawResult = QRCodeReader.obtain().decode(source);

        long end = System.nanoTime();
        Log.d(TAG, "DecodeHandler => decode-time = " + TimeUnit.NANOSECONDS.toMillis(end - start) + " ms");

        if (rawResult != null) {
            Message message = Message.obtain(handler, R.id.decode_succeeded, rawResult);
            Bundle bundle = new Bundle();
            bundleThumbnail(source, bundle);
            message.setData(bundle);
            message.sendToTarget();
        } else {
            Message message = Message.obtain(handler, R.id.decode_failed);
            message.sendToTarget();
        }
    }

    private static void bundleThumbnail(PlanarYUVLuminanceSource source, Bundle bundle) {
        int[] pixels = source.renderThumbnail();
        int width = source.getThumbnailWidth();
        int height = source.getThumbnailHeight();
        Bitmap bitmap = Bitmap.createBitmap(pixels, 0, width, width, height, Bitmap.Config.ARGB_8888);
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.JPEG, 50, out);
        bundle.putByteArray(DecodeThread.BARCODE_BITMAP, out.toByteArray());
        bundle.putFloat(DecodeThread.BARCODE_SCALED_FACTOR, (float) width / source.getWidth());
    }
}
